technetium
Chemical element with symbol Tc and atomic number 43
Also known as panormium · element 43 · Tc · masurium · eka-manganese · 43Tc
- Symbol
- Tc
- Atomic number
- 43
1
- 43
- Mass
- 97.907 Da
1
- 97.907 Da
- Melting point
- 2,170°C
- Boiling point
- 4,538 K
- Density
- 11,418.5 kg/m³
- Discovered by
- Discovered
- 1937
Overview
All data
133 statements · 23% with external sources · numbers in brackets are citations
- Canonical SMILES
- [Tc]
1
- [Tc]
- Formula
- Tc
1
- Tc
- Part of
- period 5 follows: molybdenum · followed by: ruthenium
- group 7 follows: manganese · followed by: rhenium
- transition metal
- Ionic radius
- 0.65 ångström charge number: 4 · coordination number: 6
- Electron configuration
- [Kr] 4d⁵ 5s²
- Oxidation state
- 4
- 7
- 6
- -1
- 0
- 1
- 2
- 3
Show 1 moreShow less
- 5
- Bulk modulus
- 296B Pa
- Shear modulus
- 146B Pa
- Poisson's ratio
- 0.288
- Thermal conductivity
- 51 watt per metre kelvin
- Electrical conductivity
- 4,540,000 siemens per metre
- Electrical resistivity
- 2e-7 ohm metre
- Linear thermal expansion coefficient
- 8.175 micrometre per metre kelvin temperature: 20°C
- Ionization energy
- 7.1194 eV
1
Sources- 1.“NIST Atomic Spectra Database, Ionization Energies”physics.nist.gov/asdRetrieved 2026-09-18
- 7.1194 eV
- IPA transcription
- tɛkˈniːʃ(i)əm language: English
- Atomic radius
- 135 picometre
- Covalent radius
- 147 picometre
On other databases
68 identifiers linking technetium across the web's reference databases
- Arab Encyclopedia concept ID2781
- Arabic Ontology lexical concept ID151078541
- Australian Educational Vocabulary IDscot/3581
- BabelNet ID00006874n
- Bibliothèque nationale de France ID121508612
- BNCF Thesaurus ID3496
- Brockhaus Enzyklopädie online IDtechnetium
- CAB ID257934
- CAS Registry Number7440-26-8
- ChEBI ID33353
- ChemSpider ID22396
- COD ID1534910
- Common Procurement Vocabulary code14742000
- CPV Supplementary codeAA20
- DeCS ID29561
- Dewey Decimal Classification546.543
- DSSTOX compound identifierDTXCID1047655
- DSSTox substance IDDTXSID5075028
- EC number231-136-0
- ECHA Substance Infocard ID100.028.305
- Encyclopædia Britannica Online IDscience/technetium
- Encyclopædia Universalis IDtechnetium
- Encyclopedia of China (Third Edition) ID (2026)3SkhF0
- Encyclopedia of China (Third Edition) old ID (2021)184711
- Freebase ID/m/025sk5f
- Gmelin number16310
- GND ID4184557-2
- Gran Enciclopèdia Catalana IDtecneci
- Gran Enciclopèdia Catalana ID (former scheme)0145200
- Great Norwegian Encyclopedia IDtechnetium
- Great Russian Encyclopedia portal IDtekhnetsii-32dcae
- Hrvatska enciklopedija IDtehnecij
- HSDB ID7542
- InChIInChI=1S/Tc
- InChIKeyGKLVYJBZJHMRIY-UHFFFAOYSA-N
- Interlingual Index IDi114012
- J9U entity ID987007563196105171
- JSTOR topic ID (archived)technetium
- KBpedia IDTechnetium
- Krugosvet article (archived)nauka_i_tehnika/himiya/TEHNETSI.html
- Latvian National Encyclopedia Online ID183562
- Lex IDtechnetium
- Library of Congress Authorities IDsh85133086
- MeSH descriptor IDD013667
- MeSH tree codeD01.268.271.870
- Microsoft Academic ID (discontinued)522557706
- Namuwiki ID테크네튬
- NDL Authority ID00572811
- NicoNicoPedia word article IDテクネチウム
- OmegaWiki Defined Meaning363476
- OpenAlex IDC522557706
- Pixiv Encyclopedia IDテクネチウム
- Probes And Drugs IDPD094567
- PSH ID5773
- PubChem CID23957
- Quora topic IDTechnetium
- ScienceDirect topic IDchemical-engineering/technetium
- Store medisinske leksikon IDtechnetium_-_radiologi
- SureChEMBL ID25902
- Treccani IDtecnezio
- UK Parliament thesaurus ID443372
- UniChem compound ID458278
- UNSPSC code12141742
- USGS Thesaurus ID1588
- WikiKids IDTechnetium
- WordNet 3.1 Synset ID14681226-n
- Yale LUX IDconcept/39f56a30-763d-4b99-86cf-ca484bfac72f
- YSO ID39264